| Title |
Evaluation of superconducting characteristics on the thin-film structure by NbN and Insulator coatings on pure Nb substrate |
| Authors |
- R. Katayama, Y. Iwashita, H. Tongu
Kyoto ICR, Uji, Kyoto, Japan
- C.Z. Antoine
CEA/IRFU, Gif-sur-Yvette, France
- A. Four
CEA/DRF/IRFU, Gif-sur-Yvette, France
- H. Hayano, T. Kubo, T. Saeki
KEK, Ibaraki, Japan
- H. Ito
Sokendai, Ibaraki, Japan
- R. Ito, T. Nagata
ULVAC, Inc, Chiba, Japan
- H. Oikawa
Utsunomiya University, Utsunomiya, Japan
|
| Abstract |
In recent years, it is pointed out that the maximum accelerating gradient of a superconducting RF cavity can be pushed up by coating the inner surface of cavity with a multilayer thin-film structure that consists of alternate insulator and superconductive layers. In this structure, the principal parameter that limits the performance of the cavity is the critical magnetic field or effective Hc1 at which vortices start penetrate into the first superconductor layer. We made a sample that has NbN/SiO2 thin-film structure on pure Nb substrate by DC magnetron sputtering method. In this paper, we will report the measurement results of effective Hc1 of the sample by the third-harmonic voltage method.
|
| Funding |
The work is supported by JSPS KAKENHI Grant Numbers JP17H04839, JP26600142 and the Collaborative Research Program of ICR Kyoto University (grant 2016-8, 2017-8, 2017-9). |
| Paper |
download THPAL015.PDF [0.237 MB / 3 pages] |
| Export |
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| Conference |
IPAC2018, Vancouver, BC, Canada |
| Series |
International Particle Accelerator Conference (9th) |
| Proceedings |
Link to full IPAC2018 Proccedings |
| Session |
MC7 Poster Session |
| Date |
03-May-18 09:00–12:00 |
| Main Classification |
07 Accelerator Technology |
| Sub Classification |
T07 Superconducting RF |
| Keywords |
cavity, embedded, SRF, radio-frequency, electromagnetic-fields |
| Publisher |
JACoW Publishing, Geneva, Switzerland |
| Editors |
Shane Koscielniak (TRIUMF, Vancouver, BC, Canada); Todd Satogata (JLab, Newport News, VA, USA); Volker RW Schaa (GSI, Darmstadt, Germany); Jana Thomson (TRIUMF, Vancouver, BC, Canada) |
| ISBN |
978-3-95450-184-7 |
| Published |
June 2018 |
| Copyright |
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